PLATE XI. 
Fig. 1.—Carbonicola obtusa. The hinge-plates of the shell figured on Pl. VII, fig. 16, showing a 
striated pit in the right valve posterior, and in the left anterior, to the cardinal tooth. (Page 61.) 
Fig. 2.—Carbonicola obtusa. Cockshead Rock, Hulme Colliery, Adderley Green, North Stafford- 
shire. Transverse section, showing a cavity between the hinge-plates, in which possibly was lodged an 
internal ligament or cartilage. The section is just posterior to the highest point of the umbones. 
My Collection. (Page 48.) 
Figs. 3 and 4.—Carbonicola angulata. Two pyritised examples from the Low Bottom Bed. 
Fulledge, Burnley. In the Collection of Mr. George Wild. (Page 75.) 
Fig. 5.—Carbonicola angulata. From same locality, a larger specimen. In the Collection of 
Mr. John Ward, F.G.S., of Longton. (Page 75.) 
Figs. 6 and 7.—Carbonicola similis. Two typical specimens from the Brooch Coal Series, Dudley. 
My Collection. (Page 76.) 
Fig. 7a.—Carbonicola similis. Fig. 7 viewed from above, showing the hollow character of the 
dorsal slope. 
Fig. 8.—Carbonicola similis. Cast showing muscle-scars and pallial line. Springhill Colliery, 
Ayrshire. In the Collection of Mr. Beveridge. (Page 76.) 
Fig. 8 a.—The same viewed from above, showing the accessory pedal scars. 
Figs. 9—13.—Carbonicola similis. A series from the Brooch Coal-beds, Dudley, showing the 
change in shape of the posterior end by age. Presented to me by Mr. Wm. Madeley. My Collection. 
Figs. 10a, 11a.—Carbonicola similis. Figs. 10 and 11 viewed from above, showing external 
ligament and general shape of the superior surface. (Page 76.) 
Figs. 14, 14a.—Carbonicola nucularis. Two views of a very testiferous pyritised specimen with 
much-wrinkled periostracum from the horizon of the Banbury, ? Hard Mine, Talk-o’-th’-Hill, North 
Staffordshire. My Collection. (Page 63.) 
Fig. 15.—Carbonicola similis. Brooch Coal Series, Dudley. To show the hinge-plate of the right 
valve. My Collection. (Page 76.) 
Fig. 16, 16 a.—Carbonicola nucularis. Two views of a testiferous specimen from the spoil bank of 
a disused colliery at the west foot of Mow Cop, North Staffordshire, which from the fossil contents 
I believe to be about the horizon of the Hard Mine, showing much-wrinkled periostracum. My 
Collection. (Page 63.) 
Figs. 17—28, 25—27. Carbonicola similis. A series from a thin bed above the Cockshead Rock, 
Hulme Colliery, Adderley Green, North Staffordshire, showing variations in shape often due to crushing. 
My Collection, (Page 76.) 
Fig. 24.—Carbonicola cuneiformis. The roof of the Hard Mine Coal, Bucknall. My Collection. 
(Page 78.) 
Fig. 24 a.—Carbonicola cuneiformis, viewed from above. 
Figs. 28, 29.—Carbonicola antiqua. From the Calciferous Sandstone Series, Kilminning, Fife. 
My Collection. (Page 79.) 
Fig. 28a.—Carbonicola antigua. An imperfect view of the hinge-plate of fig. 28. 
Fig. 30.—Carbonicola antiqua. This is not a cast, but the shell has been worn smooth by wave 
action. From the same bed. My Collection. (Page 79.) 
Fig. 31.—Carbonicola aquilina. A very large and fine example from the roof of the Hard Mine 
Coal, Adderley Green Colliery, Longton. My Collection. (Page 69.) 
Figs. 32 and 33.—Oarbonicola aquilina, to show curious circular perforations. Collection of 
Mr. John Ward, F.G.S., Longton. (Page 74.) 
